As stated in my previous blog article ‘What can the Office 365 “Service Administrator” / “Service Support Administrator” role do?‘, Office 365 tenant owners often use this role to delegate common administrator tasks in Office 365. The Microsoft documentation for the Office 365 Admin Roles is here:  https://support.office.com/en-ie/article/about-office-365-admin-roles-da585eea-f576-4f55-a1e0-87090b6aaa9d. So what exactly